Ostrach (disambiguation)

Ostrach is a municipality in the district of Sigmaringen in Baden-Württemberg in Germany.

Ostrach may also refer to:
 * Simon Ostrach (1923–2017), American academic scientist
 * Ostrach (Iller), a river of Bavaria, Germany, tributary of the Iller
 * Ostrach (Danube), a river of Baden-Württemberg, Germany, tributary of the Danube
 * Battle of Ostrach, occurred on 20–21 March 1799